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jhChun
2026-04-08 16:58:54 +09:00
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project/ble_peripheral/ble_app_vivaMayo/mcp4725_adc.c Normal file
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/*******************************************************************************
* @file mcp4725_adc.c
* @author CandyPops Co.
* @version V1.0.0
* @date 2022-09-05
* @brief
******************************************************************************/
#include "sdk_common.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nrf.h"
#include "boards.h"
#include "app_error.h"
#include "nrf_drv_saadc.h"
#include "ble_nus.h"
#include "mcp4725_adc.h"
#include "main.h"
#include "debug_print.h"
#define MCP4725_REF_VOLTAGE_IN_MILLIVOLTS 600.0f /**< Reference voltage (in milli volts) used by ADC while doing conversion. */
#define MCP4725_PRE_SCALING_COMPENSATION 6.0f /**< The ADC is configured to use VDD with 1/3 prescaling as input. And hence the result of conversion is to be multiplied by 3 to get the actual value of the battery voltage.*/
#define MCP4725_ADC_RES_10BITS 1024.0f /**< Maximum digital value for 10-bit ADC conversion. */
/**@brief Macro to convert the result of ADC conversion in millivolts.
*
* @param[in] ADC_VALUE ADC result.
*
* @retval Result converted to millivolts.
*/
#define MCP4725_VOUT_IN_MILLI_VOLTS(ADC_VALUE)\
((((ADC_VALUE) * MCP4725_REF_VOLTAGE_IN_MILLIVOLTS) / MCP4725_ADC_RES_10BITS) * MCP4725_PRE_SCALING_COMPENSATION)
#define ADC_SAMPLES_IN_BUFFER 1
static nrf_saadc_value_t mcp4725_adc_buf[2][ADC_SAMPLES_IN_BUFFER];
float mcp4725_voltage_in_milli_volts = 0;
//extern char ble_tx_buffer[BLE_NUS_MAX_DATA_LEN];
extern which_cmd_t cmd_type_t;
extern uint8_t ble_bin_buffer[BLE_NUS_MAX_DATA_LEN] ;
/**@brief Function for handling the ADC interrupt.
*
* @details This function will fetch the conversion result from the ADC, convert the value into
* percentage and send it to peer.
*/
void mcp4725_voltage_handler(nrf_drv_saadc_evt_t const * p_event) /* ADC_GAIN reading */
{
float Vref = 3.3f; /* It same as Vdd */
float dac_value = 0.0f;
uint16_t dac_value_16=0;
if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
{
nrf_saadc_value_t adc_result;
nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, ADC_SAMPLES_IN_BUFFER);
adc_result = p_event->data.done.p_buffer[0];
nrf_drv_saadc_uninit();
nrf_drv_saadc_channel_uninit(0);
mcp4725_voltage_in_milli_volts = MCP4725_VOUT_IN_MILLI_VOLTS(adc_result);
#if FEATURE_DETAIL_VALUE_AGC
DBG_PRINTF("AGC read Vol: %f(mV)\r\n", mcp4725_voltage_in_milli_volts);
#endif
/* For MCP4725, Dn = (Vout/Vref) x 4096, Vref = Vdd */
dac_value = (((mcp4725_voltage_in_milli_volts/Vref) * 4096.0f)/1000.0f); /* Unit is Volt */
if(cmd_type_t == CMD_UART) {
DBG_PRINTF("Te%d\r\n\r\n",(uint16_t)(dac_value + 0.5f));
} else if(cmd_type_t == CMD_BLE) {
dac_value_16 = (uint16_t)(dac_value + 0.5f);
single_format_data(ble_bin_buffer, "rse:", dac_value_16);
binary_tx_handler(ble_bin_buffer,3);
// sprintf(ble_tx_buffer, "Te%d\r\n",(uint16_t)(dac_value + 0.5f));
// data_tx_handler(ble_tx_buffer);
}
}
}
void mcp4725_adc_init(void)
{
ret_code_t err_code = nrf_drv_saadc_init(NULL, mcp4725_voltage_handler);
APP_ERROR_CHECK(err_code);
nrf_saadc_channel_config_t config =
NRFX_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN6); /* FSA5157P6X Voltage Output Measurement */
err_code = nrf_drv_saadc_channel_init(0, &config);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(mcp4725_adc_buf[0], ADC_SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(mcp4725_adc_buf[1], ADC_SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_sample();
APP_ERROR_CHECK(err_code);
}
void mcp4725_voltage_level_meas(void)
{
mcp4725_adc_init();
}